Income Taxes (Details 3) (USD $) In Thousands, unless otherwise specified	Apr. 01, 2012	Apr. 03, 2011
Deferred Tax Assets, Net [Abstract]
Reserves and accruals not currently deductible	$ 19,830	$ 22,206
Stock-based compensation	17,237	14,570
Net operating loss carryforwards	14,635	14,443
Research credits	11,222	6,618
Investment securities	1,386	1,545
Other	2,828	3,194
Total gross deferred tax assets	67,138	62,576
Valuation allowance	(1,540)	(3,654)
Total deferred tax assets, net of valuation allowance	65,598	58,922
Deferred Tax Liabilities [Abstract]
State income taxes	8,266	6,036
Property and equipment	7,044	4,086
Research and development expenditures	2,924	3,348
Purchased intangible assets	26	2,365
Total deferred tax liabilities	18,260	15,835
Net deferred tax assets	$ 47,338	$ 43,087